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OEB 192 08.09.24 Evolutionary speculation constitutes a kind of metascience, which has the same intellectual fascination for some biologists that metaphysical speculation possessed for some mediaeval scholastics. It can be considered a relatively harmless habit, like eating peanuts, unless it assumes the form of an obsession; then it becomes a vice (Stanier, 1970)

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Tree of Life: primary divisions

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Microbial systematics Formerly Pseudomonas (partial list): Ralstonia, Burkholderia, Hydrogenophaga, Sphingomonas, Methylobacterium, Cellvibrio, Xanthomonas, Acidovorax, Hydrogenophillus, Brevundimonas, Pandoraea

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16S rRNA as phylogenetic marker Why a good molecule?

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Tree of Life: three domains Based on 16S rRNA (Woese, 1987):

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Tree of Life: three domains Based on 16S rRNA (Pace, 1997):

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Tree basics: meaning

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Tree basics: rotation

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Tree basics: shape

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Tree basics: character change

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Key phylogenetic terms

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Monday (9/14): Molecular evolution and horizontal gene transfer I.